Moving an appendix behind the summary
The grid is the check: you confirm the new order on the thumbnails before anything is written, and undo steps back through mistakes.
Input
report.pdf (10 pages), dragging pages 9-10 to sit directly after page 2Output
A 10-page PDF ordered 1, 2, 9, 10, 3, 4, 5, 6, 7, 8.